Semiconductor Quantum Dots

2021 ◽  
pp. 305-330
Keyword(s):  
Quantum Dots ◽  
Optoelectronic Devices ◽  
Building Blocks ◽  
Semiconductor Quantum Dots ◽  
Continuous Absorption ◽  
Semiconductor Particles ◽  
Spatial Dimensions ◽  
Definition Of ◽  
Narrow Emission

Semiconductor particles in the range of 2-10 nm are known as quantum dots (QDs) and nano-crystals where in all the three spatial dimensions, excitons are confined. Because of very small size and special electronic properties, QDs are expected to be building blocks of many electronic and optoelectronic devices. These particles possess tunable quantum efficiency, continuous absorption spectra, narrow emission and long term photostability. These are important for various biomedical applications. In this chapter definition of semiconductor QDs, their methods of preparation and characterization along with their properties and applications have been discussed.

Nontoxic Silicon Nanocrystals and Nanodiamonds as Substitution for Harmful Quantum Dots

2009 ◽  
Vol 1241 ◽  
Author(s):  
Anna Fucikova ◽  
Jan Valenta ◽  
Ivan Pelant ◽  
Vitezslav Brezina
Keyword(s):  
Quantum Dots ◽  
Chemical Composition ◽  
Silicon Nanocrystals ◽  
Nanocrystalline Silicon ◽  
Semiconductor Quantum Dots ◽  
In Vivo Studies ◽  
Long Term Stability

AbstractThe commercially available semiconductor quantum dots have been proven to be slightly to significantly toxic by recent publications depending on the chemical composition. We are developing new non-toxic fluorescent labels based on (i) nanocrystalline silicon, suitable for in vivo studies due to their biodegrability, and on (ii) nanodiamonds, intended mainly for in vitro use due to their long-term stability and nondegradilibity.

Epitaxial growth and defect repair of heterostructured CuInSexS2−x/CdSeS/CdS quantum dots

Nanoscale ◽  
2019 ◽  
Vol 11 (41) ◽  
pp. 19529-19535
Author(s):  
Chao Wang ◽  
David Barba ◽  
Haiguang Zhao ◽  
Xin Tong ◽  
Zhiming Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Epitaxial Growth ◽  
Optoelectronic Devices ◽  
Building Blocks ◽  
Cds Quantum Dots ◽  
Defect Repair

Heterostructured quantum dots (hetero-QDs) have outstanding optical properties and chemical/photostability, which make them promising building blocks for use in various optoelectronic devices.

Imaging Takes a Quantum Leap

Physiology ◽  
2004 ◽  
Vol 19 (6) ◽  
pp. 322-325 ◽  
Author(s):  
Diane S. Lidke ◽  
Donna J. Arndt-Jovin
Keyword(s):  
Quantum Dots ◽  
Surface Chemistry ◽  
Fluorescence Imaging ◽  
Emission Spectra ◽  
Quantum Leap ◽  
In Vivo Fluorescence Imaging ◽  
Biomolecular Conjugation ◽  
Narrow Emission

Semiconducting nanocrystals, or quantum dots (QDs), have emerged as a new tool in physiological imaging, combining high brilliance, photostability, broad excitation but very narrow emission spectra, and surface chemistry compatible with biomolecular conjugation. In this review, we demonstrate the power of QDs in diverse applications, including long-term in vivo fluorescence imaging.

scholarly journals Slow drift compensation in long-term measurements in fluorescence nanoscopy with blinking colloidal semiconductor quantum dots

2018 ◽  
Vol 190 ◽  
pp. 04002
Author(s):  
Aleksei Baev ◽  
Aleksei Rozhentsov
Keyword(s):  
Image Processing ◽  
Quantum Dots ◽  
Semiconductor Quantum Dots ◽  
Colloidal Quantum Dots ◽  
Estimation Of Parameters ◽  
Slow Drift ◽  
Fluorescence Nanoscopy ◽  
Drift Compensation ◽  
Processing Accuracy

In this work we present an approach for image processing accuracy increasing in fluorescence nanoscopy of single colloidal quantum dots with blinking fluorescent behavior. The approach is based on the estimation of parameters, describing the slow collective drift, according to the information about a long series of frames with fluorescent images of single blinking quantum dots. The results of collective drift compensation for single colloidal quantum dots CdSe / ZnS supper-resolution image are demonstrated.

Assembling semiconductor quantum dots in hierarchical photonic cellulose nanocrystal films: circularly polarized luminescent nanomaterials as optical coding labels

2019 ◽  
Vol 7 (44) ◽  
pp. 13794-13802 ◽  
Author(s):  
Mingcong Xu ◽  
Chunhui Ma ◽  
Jin Zhou ◽  
Yushan Liu ◽  
Xueyun Wu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optoelectronic Devices ◽  
Semiconductor Quantum Dots ◽  
Cellulose Nanocrystal ◽  
Circularly Polarized ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence ◽  
Nanocrystal Films ◽  
Optical Coding ◽  
Tunable Emission

Exploring semiconductor quantum dots (QDs) with circularly polarized luminescence (CPL) is desirable to design optoelectronic devices owing to the easily tunable emission wavelengths and photophysical stability.

scholarly journals Hybrid GaAs/AlGaAs nanowire --- quantum dot system for single photon sources

2018 ◽  
Vol 52 (4) ◽  
pp. 469
Author(s):  
G.E. Cirlin ◽  
R.R. Reznik ◽  
I.V. Shtrom ◽  
A.I. Khrebtov ◽  
Yu.B. Samsonenko ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Molecular Beam ◽  
Single Photon ◽  
Optoelectronic Devices ◽  
Building Blocks ◽  
Quantum Devices ◽  
Molecular Beam Epitaxial ◽  
Single Photon Emitters ◽  
Molecular Beam Epitaxial Growth ◽  
Combine Quantum

AbstractIII–V nanowires, or a combination of the nanowires with quantum dots, are promising building blocks for future optoelectronic devices, in particular, single-photon emitters, lasers and photodetectors. In this work we present results of molecular beam epitaxial growth of combined nanostructures containing GaAs quantum dots inside AlGaAs nanowires on a silicon substrate showing a new way to combine quantum devices with Si technology.

Nanostructure of semiconductor quantum dots in a borosilicate glass matrix by complementary use of HREM and AEM

1990 ◽  
Vol 48 (4) ◽  
pp. 728-729
Author(s):  
M.J. Kim ◽  
L.C. Liu ◽  
S.H. Risbud ◽  
R.W. Carpenter
Keyword(s):  
Quantum Dots ◽  
Borosilicate Glass ◽  
Glass Matrix ◽  
Optical Switching ◽  
Response Times ◽  
Fast Response ◽  
Processing Technique ◽  
Internal Stresses ◽  
Electron Hole ◽  
Spatial Dimensions

When the size of a semiconductor is reduced by an appropriate materials processing technique to a dimension less than about twice the radius of an exciton in the bulk crystal, the band like structure of the semiconductor gives way to discrete molecular orbital electronic states. Clusters of semiconductors in a size regime lower than 2R {where R is the exciton Bohr radius; e.g. 3 nm for CdS and 7.3 nm for CdTe) are called Quantum Dots (QD) because they confine optically excited electron- hole pairs (excitons) in all three spatial dimensions. Structures based on QD are of great interest because of fast response times and non-linearity in optical switching applications.In this paper we report the first HREM analysis of the size and structure of CdTe and CdS QD formed by precipitation from a modified borosilicate glass matrix. The glass melts were quenched by pouring on brass plates, and then annealed to relieve internal stresses. QD precipitate particles were formed during subsequent "striking" heat treatments above the glass crystallization temperature, which was determined by differential thermal analysis.

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